src/jdk.jextract/share/classes/com/sun/tools/jextract/JavaSourceFactory.java

*** 88,103 ****
          this.types = new HashMap<>();
          this.libraryNames = ctx.options.libraryNames;
          this.libraryPaths = ctx.options.recordLibraryPath? ctx.options.libraryPaths : null;
          this.noNativeLocations = ctx.options.noNativeLocations;
          this.global_jsb = new JavaSourceBuilder();
!         this.srcDir = Paths.get(ctx.options.srcDumpDir)
!             .resolve(headerFile.pkgName.replace('.', File.separatorChar));
      }
  
      // main entry point that generates & saves .java files for the header file
!     public void generate(List<Tree> decls) {
          global_jsb.addPackagePrefix(headerFile.pkgName);
  
          Map<String, Object> header = new HashMap<>();
          header.put("path", headerFile.path.toAbsolutePath().toString());
          if (!libraryNames.isEmpty()) {
--- 88,104 ----
          this.types = new HashMap<>();
          this.libraryNames = ctx.options.libraryNames;
          this.libraryPaths = ctx.options.recordLibraryPath? ctx.options.libraryPaths : null;
          this.noNativeLocations = ctx.options.noNativeLocations;
          this.global_jsb = new JavaSourceBuilder();
!         this.srcDir = ctx.options.srcDumpDir != null?
!             Paths.get(ctx.options.srcDumpDir).resolve(headerFile.pkgName.replace('.', File.separatorChar)) :
!             null;
      }
  
      // main entry point that generates & saves .java files for the header file
!     public Map<String, String> generate(List<Tree> decls) {
          global_jsb.addPackagePrefix(headerFile.pkgName);
  
          Map<String, Object> header = new HashMap<>();
          header.put("path", headerFile.path.toAbsolutePath().toString());
          if (!libraryNames.isEmpty()) {
*** 139,157 ****
--- 140,164 ----
              global_jsb.addNestedType(jsb);
          }
  
          global_jsb.interfaceEnd();
          String src = global_jsb.build();
+         if (srcDir != null) {
              try {
                  Files.createDirectories(srcDir);
                  Path srcPath = srcDir.resolve(clsName + ".java");
                  Files.write(srcPath, List.of(src));
              } catch (Exception ex) {
                  handleException(ex);
              }
          }
  
+         Map<String, String> srcMap = new HashMap<>();
+         srcMap.put(headerClassName, src);
+         return srcMap;
+     }
+ 
      protected void handleException(Exception ex) {
          log.printError("cannot.write.class.file", headerFile.pkgName + "." + headerFile.headerClsName, ex);
          log.printStackTrace(ex);
      }